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(No'ModeL) T. S. & W. W. DAVIS.

MECHANICAL TELEPHONE.

Patented Jan. 22, 1889.

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UNITED STATES PATENT OEEIcE.

THOMAS S. DAVIS, OF CAPE GIRARDEAU, MISSOURI, AND XVILLIAM \V. DAVIS, OF LAYVRENOE, KANSAS, ASSIGNORS OF ONE-THIRD TO THOMAS .IOl IXSON,

OF CAPE GIRARDEAU, MISSOURI.

MECHANICAL TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 396,688, dated January 22, 1889.

Application filed July 14,1883 Serial No. 280,002. (No model.)

To aZZ whom it may concern:

Be it known that we, THOMAS S. DAVIS and \VILLLUI \V. DAVIS, citizens of the United States, the said THOMAS S. DAVIS residing at Cape Girardeau, in the county of Cape Girardeau and State of Missouri, and the said .VILLIAu W. DAVIS residing at Lawrence, in the county of Douglas and State of Kansas, have invented a new and useful Improvement in Mechanical Telephones, of which the following is a specification.

Our invention relates chiefly to the adjustment of the telephone-box to wall-bracket by means of a steel spring and adjustable eccentric-blocks, so that the conducting-wire at tached to diaphragm of telephone is always taut in the extremes of temperature of summer and winter, and also that tension of cond noting-wires is equalized by the steel spring, thus obviating the continued breaking asunder and tearing of conducting-wires, thereby rendering mechanical telephones useless as at present made; further, in the adjustment of our telephone-box to bracket by means of adjustable eccentric-blocks in such manner that the conducting-wire can be fastened to button of diaphragm at right angles to same, thus facilitating the clearing of obstacles in the path of the wire; also, in the providing of our telephone-box with bell and call or indicator, by means of which communication is facilitated, as will be explained farther on. \Ve attain these ends by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a front view. Fig. 2 is a side view. Fig. 3 is a central vertical section through telephone-box. Figs. 4 and 5 are respectively enlarged side views of the respective halves of our adjustable eccentric-blocks and enlarged top view of same. Fig. 6 is an enlarged central vertical section through our adjustable eccentric-blocks and steel spring, with part of telephone-box broken away, showing method of attaching our telephonebox to bracket at an extreme angle, and, generally, to explain the use of our adjustable eccentric-blocks, whereby in the adjustment of our telephone-box to bracket any angle may be overcome.

Similar letters refer to similar parts throughout the several views.

A represents our telephone-box; 13, steel spring to which telephone-box is attached by screws.

. O O are the two halves formingour adjustable eccentric-blocks.

D is the bell.

E is the call or indicator, and F is the bracket.

The telephonebox A, with its diaphragm G and button II, to which the conducting wire X is attached, we make in the usual manner.

For the purpose of keeping the conductingwire X attached to button ll of diaphragm G of telephone-box A always taut, and preventing-the conducting-wire X from breaking and tearing asunder in the extremes of temperature of summer and winter, we attach by screws to back of telephone-box A steel spring B, having shank b said shank b having slot 0 Said steel spring B we form of piece of tempered steel, having its upper end, which is attached to telephone-box A, bent out ward, leaving its shank l) vertical, so that in the adjustment of said steel spring l3 to bae k of telephone-box A the vertical back of shank Zr of steel spring B will fit the vertical out side face of our adjustable eccentric-blocks O C, and thus, by the elasticity of said steel spring 13, equalize all strain and tension on the conducting-wire X.

In order that the conducting-wire X can be fastened at right angles to button II of diaphragm G, and thus facilitate the clearing of obstacles by said conducting-wire, we apply our adjustable eccentric-blocks C t, and in tel-pose said adjustable eccentric-blocks O 0 between the bracket F and shank l) of steel spring B, adjusting and fastening the parts together by bolt 0 and nut c", said bolt 0 passing through hole in bracket F, core in of adjustable eccentric-blocks and slot c otshank l) of steel spring ll, said nut c being screwed to said bolt c on outside of shank I), thus effectually securing the parts together, said slot in shank Z) allowing of any variation in the adjustment. Said adjustable eccentric-blocks (see Figs. 4., 5,

and 6) we make of cylindrical pieces of wood, having center on cored out in same for passage of bolt 0', and divided into equal parts by diagonal cross-cuts f f, admitting the face of the diagonals f f to meet each other, so as to permit each half of our eccentric-blocks O C to revolve on each other in the manner of an eccentric, and by this means allow the adjustment of our telephone-box to any angle desired, as will be more readily seen by reference to Fig. 2, where our telephone-box A is adjusted at its normal angle, and by reference to Fig. 6, where it is adjusted at the extreme angle permitted by our adjustable eccentric-blocks O 0, thus enabling us always to attach the conductingwire X to button of diaphragm at right angles.

To better facilitate communication, we provide our telephone-box A with bell D and call or indicator E. Said bell D we depend over our telephone-box A from curved wire (1, fastened to back of box, and said call or indicator E we attach by hinge n to wire 6, and place same adjoining the bell D,and also immediately over our telephone-box A, and fasten its wire (2' in like manner to back of box, said hinged call or indicator E by its hinge n being always kept up in posit-ion ready to drop, as shown in dotted lines, Figs. 2 and 3, said bell D and call or indicator E being for the purpose of calling the attention of the party at the other end of conductingwire X, (whose telephone-box must be similarly provided with bell and call or indicator,) and both being operated simply by slightly tapping the telephone-box A, by which the conducting-wire X is agitated through tension of the steel spring B, thus causing the ringing of said bell I) and the dropping of said call or indicator E of said telephonebOX A.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In mechanical telephones, steel spring B, having vertical shank l) and slot 0 said steel spring B being bent outward at its upper end and fastened to telephone-box A, in combination with the adjustable eccentricbloeks O 0, core m, bolt 0, and nut 0 as and for the purpose set forth. v

2. The adjustable eccentric-blocks C 0, having diagonal faces f f and core on, said eccentric-blocks C C being adjustable on their diagonal faces ff in the manner of an eccentric, in combination with comlucting-wire X of telephone-box A, bracket F, shank Z) of steel spring B, bolt 0, and nut 0 as and for the purpose set forth.

3. The combination of telephone-box A with bell D, depending from wire (1, and call or indicator E, having hinge n attached to wire a, said bell D and call or indicator E being attached by said wires to said telephone-box A and placed immediately over same, as and for the purpose set forth.

In testimony whereof we affix our signatures in presence of two witnesses.

THOMAS S. DAVIS. XVILL AM XV. DAY'IS.

Vitnesses:

SAMUEL ORGAN, ROBERT (I. BAYS. 

